Integrated circuit, electronic equipment and method of assembly which uses said integrated circuit

ABSTRACT

A memory capacity of a memory circuit having a program data which practices a software function is provided with a fixed amount corresponding to each one from an upper rank function to a lower rank function of the software and selects one function (of preparing kind functions) from a series of the integrated circuit group having an interchangeability with respect to lower ranks incorporates those each memory circuit corresponding to the preparing kind functions.

This is a continuation, of Application Ser. No. 08/424,954, filed Apr.19, 1995 now abandon.

BACKGROUND OF THE INVENTION

This invention relates to an integrated circuit, and electronicequipment and an assembly method which uses suitable integrated circuitswhen preparing many kinds of electronic equipment having varieties offunctions from an upper rank to a lower rank function respectively,according to demand.

The electronic equipment includes a magnetic recording and regenerativeunit, video recorder/player, video-cassette recorder and the like. Inthis case, the additional functions to the magnetic recording andregenerative units include, for example, an on-screen display (OSD), PALsystem applicable to a plurality of different languages, HiFi, andtwo-head system or four-head system having a specification of HiFi orNTSC/PAL regenerative system.

The conventional technologies are explained in an example for themagnetic record and/or the generative apparatus or video tape recorder(hereinafter called "VTR"). The basic structure of this VTR is shown bybig block view in FIG. 1.

In FIG. 1, 101 is a TV signal processing portion which processes signalsfrom a tuning circuit 102 of the TV signal, 103 is a video signalprocessing portion which outputs TV signals being output from said TVsignal processing portion to a recording and/or generative circuit 104where signal recording and generation thereof are performed inconjunction with a magnetic tape and rotary magnetic heads 105 havingtwo-head system or four-head system, and 113 is an antenna terminal.

Number 106 is a timer portion which counts time for a reservation of TVprogram and for present time, 107 is a key interface portion whichinputs a signal from the key input portion 108, 109 is a driver portionwhich controls an indication to a fluorescent indicating tube 110, and111 is a driving control portion which outputs the control signal to thedriving mechanism 113 which controls magnetic head 105 and capstan 112for a servo control (speed control, phase control).

A system control portion 120 controls the whole VTR with input andoutput signals through connections to the tuning circuit 102, timerportion 106, magnetic signal processing portion 103, key interfaceportion 107, fluorescent indication tube driver portion 109, and thedriving control portion 111, respectively.

Formerly, in the VTR described above, the timer portion 106, fluorescentindicator tube driver portion 109, and the system control portion 120are stored in an integrated circuit 121. On the other hand, the drivecontrol portion 111 is structured to an exclusive integrated circuitcalled a "digital servo integrated circuit" (this structure ishereinafter called "system 1"). However, in the case of a four-headedsystem, special regeneration (especially slow regeneration) cannot besmoothly operated in this structure, and a special regenerativeintegrated circuit or an expensive servo integrated circuit having suchfunction must be additionally used. Thus, in the above structure system1, when the four-headed system is used, the following two structures arewidely used:

a structure wherein the system control portion 120 and the drivingcontrol portion 111 are stored in an integrated circuit 122, while thetimer portion 106 and the fluorescent indicating tube driver portion 109are stored in another integrated circuit 123 (this structure ishereinafter called "system 2"); or a structure wherein the systemcontrol portion 120, driving control portion 111 and the timer portion106 are stored in an integral circuit 124, and the fluorescentindicating driver portion 109 is used as an exclusive integrated circuit(this structure is hereinafter called "system 3").

At present, various kinds of VTRs are manufactured and distributedaccording to user's requests, e.g., even in the VTR of the NTSC systemin Japan and the U.S., there exist 2-headed and four-headed systems, andthose two systems have further functional additions (e.g., OSD, HiFi,etc.). Such production of various types in small amounts impedes costreductions. To overcome this, even when many kinds of VTRs havingdifferent functional additions are made, common use of partsincorporated into an inner portion and the preparation step areperformed. Particularly, when the layout of the circuit boards is madein common, since the common parts are assigned at the same position onthe circuit board, an automatic insertion of parts is available by usingan automatic inserter, or manual insertion by hand becomes easy, therebyincreasing productivity. In other words, in the case of automaticinsertion, if the positions of commonly usable parts thereof arememorized, then its insertion can be performed by correction or additionof each memory provided at a certain part according to each kind withoutany memory of inserting position from first. In addition, in the case ofmanual insertion, the generation of insertion errors by the operatordecreases because the insertion position is the same with respect to thepart.

However, when this common usage of parts is enlarged to integralcircuits, among the VTR of two- and four-headed systems having variouskinds of functional additions, the specification of said integratedcircuit is set so that the highest rank function VTR having the largestnumber of functional additions may operate, then said integrated circuitis allowed to keep the interchangeability to the lower rank function,and accordingly, the VTR in which said integrated circuit isincorporated, includes unused functions.

Accordingly, in order to decrease manufacturing cost, VTRs of a two-headsystem are made to be common in circuit board and parts by using thestructure of system 1, while VTRs of a four-head system are made to becommon in circuit board and parts by using the structure of system 2 or3.

As is illustrated in systems 1, 2 and 3, at least two large-scaleintegrated circuits were used as its main structures, resulting inincreased costs.

Further, as the system control portion and the fluorescence indicatingtube driver portion, or the system control portion and the drivingcontrol portion were provided in separate large-scale integratedcircuits, both integrated circuits were connected with copper foil wireson the circuit board. Accordingly, noises from other devices providedboth inside and outside the unit, overlap at the copper foil wiresthrough which the control signal is sent, and cause mistakes inoperation. In addition, when the package shape of said integratedcircuit (including number of pin) becomes a plurality, the manufacturingstep of the integrated circuit and its examination are performed atdifferent organizations, and the results of the examination becomedifferent. Accordingly, the simplification of the manufacturing steps ofthe integrated circuit becomes difficult, and the decrease in cost ofthe integrated circuit body is also difficult.

On the other hand, if a single integrated circuit is used, the memorycircuit (such as ROM, etc.) for software mounted on said integratedcircuit requires a great memory capacity for keeping the highestfunction. Accordingly, the VTR products which use only the lowestfunction carry unnecessary and expensive memory and no meaning to use asingle integrated circuit can be found.

This invention solves such problems and its objects include thefollowing:

1. To make the package shape (number of pins) in the integrated circuitfor electronic equipment system control in common use;

2. To select and use one of said integrated circuit groups having anecessary and the minimum suitable ROM capacity corresponding to each ofa plurality of functional additions;

3. To decrease the manufacturing cost of the equipment by restrictinglarge-scale integrated circuits to be used to only one; and

4. To decrease the cost of the assembly step by making the main printedcircuit board commonly useful and making the inserting positions of theelectronic parts to be mounted to the same position; and

to eliminate the wiring between circuit boards by storing the systemcontrol portion and a driven control portion to said one integratedcircuit by an effect of one main printed board and to preventoperational errors due to the overlapping of noises.

BRIEF DESCRIPTION OF THE INVENTION

The present invention relates to an integrated circuit for controllingsystems of the electronic equipment provided with a memory circuittherein, comprising:

said memory circuit memorizes a program which practices a softwarefunction of said electronic equipment, and forms one of a series ofintegrated circuit groups which has an interchangeability with respectto said lower rank function by incorporating a one memory circuit havingeach function from a software of a higher rank to a software of a lowerrank respectively; each memory capacity of said series of integratedcircuit group has a fixed amount which lessens corresponding to each onefrom said software of upper rank function to lower rank functionrespectively; the arranged position and size of each outer input-outputlead wire of said series of the integrated circuit group are partiallyor totally the same as those of the lead wire of the integrated circuitof upper rank function; and said signal which inputs or outputs saidlead wire has an interchangeability with respect to the integratedcircuit to the lower rank function.

The present invention also relates to an electronic equipment providedwith an integrated circuit as described above, wherein a main printedcircuit board equipped with said integrated circuit and electronic partsrelated to said integrated circuit which entirely controls saidelectronic equipment, has lead wire connecting holes so that lead wiresof particular electronic parts are consistently inserted at the samecoordinated position on the main printed circuit board, assignedpositions and its sizes of the connector portion for connecting it tothe outer portions from the main printed circuit board are identical forthe main printed circuit board, and a main printed circuit board issolely used from said upper rank functions through the lower rankfunctions.

The main printed circuit board provided with said integrated circuit andthe electronic parts related thereto in the present invention, carries acommonly usable wiring pattern for any integrated circuits of from saidupper rank function to said lower rank functions, and any particularelectronic parts can be inserted at the same coordinated position on thesame wiring pattern.

Electronic equipment of the present invention includes a magnetic videorecorder and/or its regenerator.

The integrated circuit of said electronic equipment in the presentinvention may be provided with a total system control portion includingrecording and/or regeneration processing circuit, timer portion,indication tube control driver portion, with a logic circuit which isdirected to a driving control portion of the head and capstan, and withsaid memory circuit which memorizes a program by which a softwarefunction is executed to control two heads or four heads and head andservo driving control of capstan corresponding to the kinds of thefunction added thereto; and said electronic parts related to saidintegrated circuit at least include a TV signal tuning circuit,indication tube interface portion, key input interface portion, audiocircuit portion, a video circuit and a head and capstan drivinginterface portion.

The present invention also relates to a method of assembling electronicequipment, in which:

a step of selecting at least one integrated circuit corresponding to akind of an equipment to be produced and functions to be added from saidseries of integrated circuit group;

a step of inserting said selected integrated circuit to said mainprinted circuit board; and

a step of mounting said electronic parts only onto said coordinatedpositions corresponding to said kind of equipment to be produced andfunction to be added on said main printed circuit board are carried outin this order.

A magnetic video recorder and/or its regenerator which is provided witha memory circuit which memorizes enough amount of program data toexecuted aimed software functions and essential amount of memoriescorresponding to said software functions from a higher rank through alower rank, and an integrated circuit selected for an aimed product froma series of integrated circuit groups having an interchangeability to alower rank, which comprises:

said selected integrated circuit is provided with a digital circuitintegrating the system control portion of said total recorder and/orregeneration unit, timer portion and indication tube control driveportion, and

a memory circuit having a software function of the program data by whichtwo heads or four heads and the servo control of the head and capstanportion corresponding to the specification of plurality of addedfunctions regarding the heads;

the assigned position and size of the input and output lead wire of saidintegrated circuit group and input and output signal thereof have aninterchangeability to the lower rank function, respectively; and

the main printed circuit board incorporating said integrated circuitcarries a commonly usable wiring pattern for any integrated circuit fromsaid upper rank function to the lower rank function.

The integrated circuit for system control of the electronic equipment ofthis invention incorporates the memory circuit which memorizes thesoftware memory and practical programs. This memory circuit forms anintegrated circuit group having a series of the lower rankinterchangeability from the upper rank function to the lower rankfunction as a necessary minimum memory capacity corresponding to eachfunction, and the lead wire of this integrated circuit is the same inposition and size and is provided with lower rank interchangeability.Accordingly, when this integrated circuit is used with the electronicequipment, an integrated circuit having the necessary and minimumintegrated circuit can be selected.

In the electronic equipment which uses said integrated circuit, the mainprinted circuit board mounted with the electronic parts including saidintegrated circuit, has the lead wires connecting holes always atidentical positions so that particular electronic parts are inserted atthe same assigned positions, all of the electronic parts necessary forthe production of electronic equipment which have the highest rankfunctions are allowed to be inserted on the main printed circuit boardand as the electronic equipment carries the lower rank functions, thenumber of electronic parts is lessened. In other words, the connectingholes of the lead wires of unnecessary electronic parts are not used.Accordingly, only one main printed circuit board is used in common, andsince the position of the coordinates of the electronic part to insertis unchangeable from the upper rank function to the lower rank function,the use of an automatic inserter is possible. In addition, in the eventof manual insertion, the error insertion examination can be performed ina short time.

Even if said main printed circuit board is used in the same pattern, thesame operation is obtained.

The magnetic video recording and/or the regeneration unit is providedwith the system control portion of said equipment, timer portion,indication tube control drive portion, a logic circuit for mainlycontrolling heads and capstan, and a memory circuit which memorizesprograms by which software performs the servo driving control of thehead and capstan. The unit is also provided with at least one integratedcircuit which is necessary and minimum for the equipment of two- orfour-head system, to which aimed function is added, and the main printedcircuit board is also provided with the electronic parts correspondingto said units, such as TV signal tuning circuit, indication tube, keyinput portion, interface portion, audio and video circuit portion anddriving interface portion of head and capstan.

The recorder and/or the regeneration unit can be assembled by thefollowing method. The integrated circuit group for system control ofthis invention is prepared to cover a full range of varieties from upperrank function to lower rank function having an interchangeability to thelower rank thereof, in the production of the recorder and/or theregeneration unit, of two or four-head system with one certainfunctional addition, an integrated circuit having a necessary andminimum memory circuit capacity corresponding to the two- or four-headsystem with the aimed function added is selected in the first step.

In the second step, said selected integral circuit is mounted on themain printed circuit board which is useful in common to any integralcircuit of said record and/or regeneration unit, and in the third step,other electronic parts necessary to the function thereof are alsomounted. Since said circuit board is made commonly useful, saidelectronic parts can be easily mounted on said circuit board just byinserting the parts automatically or manually because the same parts arethe same coordinated position.

The memory circuit of said integrated circuit stores the program data ofthe software function which controls the servo system of the head andthe capstan of the unit, and its memory capacity of said memory circuitis decreased to be necessarily minimum.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an explanatory view which shows a structure of the controlcircuit in the conventional VTR.

FIG. 2 is an explanatory view which shows a control circuit of a VTRaccording to an embodiment of this invention.

FIG. 3 is a main printed circuit board according to an embodiment ofthis invention.

DETAILED DESCRIPTION OF THE INVENTION

An embodiment of this invention will be described with reference to thedrawing as follows.

In FIG. 2, 31 is a TV signal processing portion which processes signalsfrom the tuning circuit 32 of TV signal and 33 is an antenna terminal.The tuning circuit 32 and TV signal processing portion 31 are mounted onthe main printed circuit board 50 as an electronic part.

The numeral 12 is a video signal processing portion which processesinput and output of magnetic signal between signal record regenerationcircuit 16 through magnetic tape and rotary magnetic head 14 (four-headsystem) or magnetic head 15 (two-head system). In the case of thetwo-head system and four-head system, corresponding video signalprocessing portion 12 and record regeneration circuit 16 are alsomounted on the main printed circuit board 50 as an electronic part.

The numeral 36 is a timer portion which counts present time and apre-engaged record of the TV programs, 37 is a key interface portionwhere the signal from key input portion 38, 39 is a driver portion wherean indication to the fluorescent tube 40 is controlled, and 13 is adriving control portion which processes input and output of driversignals of servo systems including driving mechanism 17, magnetic heads14 or 15 and capstan 42. ROM portion 13a (memory circuit) stores a headservo system control program, including a capstan 42 corresponding toeither one kind of two-head or four-head system unit to which variousfunctions are added. In the memory capacity of the program data, anecessary minimum capacity which can be correspondent to this from thelower rank function to the higher rank is made to be either necessaryminimum capacity from about 12K byte to about 32K byte. Such electronicparts as key input portions 38, key interface portion 37 andfluorescence indication portion 40 including interface portion are alsomounted on the main printed circuit board 50.

The numeral 20 is a system control portion which controls the total VTRunit including the TV signal processing portion 31 and video signalprocessing portion 12, and a system control program which can becorrespondent to any two-head system and any four-head system havingvarious kinds of specifications of each function additions is stored inthe ROM 20a.

The numeral 10 of the circuit portion surrounded with a broken line inFIG. 2 shows an integrated circuit which is a video control circuitintegrally circled on tip 1. Further, the circuit portion surroundedwith a dot-and-dash line is an electronic part mounted on the mainprinted circuit board 50.

The assembly method of VTR unit which uses the integrated circuit 10 ofthis invention for system control of series kind wherein only 1 tip ROMportion 13a is different is described as follows.

In VTRs, there exist a plurality of kinds from higher rank function (aplurality of functions are added) to lower rank function (addedfunctions are poor), and software which operate these functions areincorporated in the integrated circuit. A different plurality of kindsof integrated circuits 10 are prepared.

First, from these circuits 10, an integrated circuit 10 which agreeswith a head system having a function added specification to be preparedis selected.

For instance, when the VTR is a four-head system with OSD function, andfurther has a HiFi function, an integrated circuit 10 having the highestfunction and a great capacity memory circuit of about 32K bytes have tobe selected. On the other hand, two-head system with no OSD and no HiFifunction necessitate the lowest rank function, and the memory capacityshould be an integrated circuit 10 having a small capacity of memorycircuit 13a of about 12K bytes.

The integrated circuit 10 thus selected is made to be a package shape incommon so as to be attachable to a common main printed circuit board 50.Further, other electronic parts such as video signal processing portion12, TV signal processing portion 31, key interface 37 and other variouskinds of electronic parts shown in FIG. 2 are picked up to add andmounted on a main printed circuit board 50. The mounting of theelectronic parts to the main printed circuit board 50 can be preparedmore effectively if an automatic inserter or the like is used. However,it is possible even by manual insertion.

In other words, since the main printed circuit board 50 is made to becommon so that the same electronic parts may be inserted in the samecoordinate positions, the inserted position is not changed even if thefunction added specifications are different. In the case of a lower rankfunction, unnecessary electronic parts are not inserted.

This will be described in more detail in FIG. 3. FIG. 3 shows anembodiment of the main printed circuit board 50. There exists anintegrated circuit 10 for system control having the memory circuit 3anear the middle portion of the main printed circuit board 50. RO is aconnected hole of the lead wire of the integrated circuit 10. Thenumerals 11, 12 and 13 show the electronic parts E1, E2, E3, E4 . . . ,such as condenser, resistance, etc. R1, R2, R3 . . . are holes of theconnected holes of the lead wire of the integrated circuits R1, R2, R3 .. . Further, S1, S2, S3, S4 . . . are the connected holes of the leadwire of the condenser, resistance E1, E2, E3, E4 . . . C1, C2, C3 showthe connector portions and D1, D2, D3 show each connected hole of eachlead wire. The numeral 38 is a key input portion, and P shows aconnected hole of each lead wire. The connect holes R0 of lead wire inthe main printed circuit board 50 R1, R2, R3 . . . S1, S2, S3 . . . ,D1, D2, D3 and P may be in common by arranging these at fixedcoordinates without any relation to the addition of the VTR function. Inthe case of preparation of the lower rank function VTR, the connectingholes for lead wiring of unnecessary electronics parts are not used. Theprinted circuit between connected holes of the lead wire in FIG. 3 isnot shown.

The VTR equipment thus prepared operates as follows:

The servo control program ROM portion 13a of the driving control portion13 is practiced by the program of ROM 20a of said system control portion20. For instance, in the case of integrated circuit 10 of the two-headsystem, a servo program corresponding to the two-head system ispracticed, thereby the driving control of the capstan motor and thehead-driving motor are performed.

Further, the image signal to be recorded in the magnetic tape by thevideo signal 2 or the two-head magnetic head 15 read from magnetic head15 of the two-head is processed by signal.

On the other hand, in the case of the four-head system integratedcircuit 10, the servo program corresponding to the four-head system ispracticed thereby performing the driving control by driving mechanism 17of the capstan motor and the head-driving motor.

Further, the video signals read from the magnetic heads 14 of thefour-head system and image signals to be recorded on the magnetic tapewith head 14 are processed at the video signal processing portion 12.

According to this invention, the following effects are obtained.

(1) Since the logic circuit portion of the integrated circuit for systemcontrol of the electronic equipment is made to have a lower rankinterchangeability including the pin arrangement so as to correspondfrom a higher rank to a lower rank of a series of function addition ofthe electronic equipment, while the memory circuit portion whichmemorizes the software function is adapted to provide a series of theintegrated circuit corresponding to the function addition of theelectronic equipment to be prepared to necessary minimum memory capacityaccording to the function addition, an integrated circuit correspondingto the electronic equipment to be prepared can be selected, therebydecreasing preparation costs.

(2) Since the number of the large-scale integrated circuits used in theelectronic equipment is restricted to only one and one sheet of the mainprinted circuit board is adapted to be in common, and the insertionposition of said electronic parts to be mounted are the same so as to beable to use the automatic inserter, assembly costs are decreased and theexamination step is shortened.

(3) Even if the layout of both printed circuits are the same pattern,the same effect can be obtained.

(4) Even if the electronic equipment is the recording and/orregeneration unit, the effects shown in (1)-(3) can be obtained.

(5) The logic circuit portion of the integrated circuit is integrated toonly one as a system control portion, timer portion, indication tubecontrol driver portion, and head and capstan driving control portion,while the software function program which performs the servo drivingportion of the head and capstan is made to be a series of the integratedcircuit group provided with a memory circuit having the necessary andminimum memory capacity according to the function addition of theelectronic parts related to said integrated circuit is made to beinserted on a sheet of main printed circuit board so as to be able toarrange in the common coordinate, various kinds of even the recordingand/or regeneration equipment having varieties of functions can bemanufactured in a large scale production method.

(6) The method of assembly of such electronic equipment can shorten thepreparation time to increase the yield of the product by selection ofthe integrated circuit corresponding to the integrated circuit group inthe first step, insertion of said electronic parts to the common circuitboard of the selected integrated circuit in the second step, andautomatic insertion or manual insertion (easy insertion) of only thenecessary electronic parts to the function addition in the third step.

(7) Since only one integrated circuit is used, and the memory circuitthereof can be one having a ROM portion of a necessary and minimum ROMcapacity corresponding to two-head or 4-head system having functionaddition from the higher rank to the lower rank, even in the case ofpreparation of a low rank addition VTR its manufacturing costs are notincreased very much.

(8) Since only one integrated circuit is used, errors in operation dueto the control signal line or the like between the system controlintegrated circuit and the indication tube integrated circuit areprevented.

(9) Since the integrated circuit is allowed to hold a lower rankinterchangeability to a form (leader) and a signal line and the mainprinted circuit board are common to the total kinds from a higher rankto a lower rank, a mass production of varieties of products in smallamounts can be attained by using an automatic inserter. Manufacturing ofthe integrated circuit and its testing steps are much simplified, andthe number of jigs for the tests can be decreased.

What is claimed is:
 1. A video tape player (VTR) comprising:a printedcircuit board (PCB) provided with a set of integrated cicuit (IC)inserting holes formed on said PCB; one of a first integrated circuit(IC) and a second integrated circuit (IC) selectively mounted on saidPCB, said first and second IC-s having a system control memory by whichboth of a two-head playback function and a four-head playback functionare commonly controllable, said first IC having a first control programmemory by which said two-head playback function is controllable and aplurality of first input/output pins insertable into said IC insertionholes, said second IC having a second control program memory by whichsaid four-head playback function is controllable and a plurality ofsecond input/output pins insertable into said insertion holes, saidfirst control program memory having a first memory capacity for storinga first control program for controlling said two-head playback function,said second control program memory having a second memory capacity forstoring a second control program for said four-head playback function,each of said integrated circuits comprises a system control portion, atimer portion, an indication tube control driver portion, and drivingcontrol portion, one of a two-head system rotary magnetic head and afour-head system rotary magnetic head which is selectively adopted incorrespondence with selected one of said first IC and said second IC;and a driving means which drives one of said two-head system rotarymagnetic head and said four-head system rotary magnetic head inaccordance with one of said first control program stored in said firstcontrol program memory and the second control program stored in saidsecond control program memory, said driving control portion beingprogrammed to control said driving means, each of said integratedcircuits being made to be inserted into said set of IC insertion holesformed on said printed circuit board, whereby either one of said firstand second integrated circuits may be mounted on said printed circuitboard and a plurality of video tape players having different functionscan be manufactured in a large scale production method.
 2. A method ofselectively assembling a video tape player (VTR), comprising the stepsof:providing a printed circuit board (PCB) with a set of integratedcircuit (IC) insertion holes formed on said PCB; selectively mountingone of a first integrated circuit (IC) and a second integrated circuit(IC) on said PCB, said first and second IC-s having a system controlprogram memory by which both of a two-head playback function and afour-head playback function are commonly controllable, each of saidintegrated circuits comprising a system control portion, a timerportion, an indication tube control driver portion and driving controlportion, said first IC having a first control program memory by whichsaid two-head playback function is controllable and a plurality of firstinput/output pins insertable into said IC insertion holes, said secondIC having a second control program memory by which said four-headplayback function is controllable and a plurality of second input/outputpins insertable into said IC insertion holes, said first control programmemory having a first memory capacity for storing a first controlprogram for controlling said two-head playback function, said secondcontrol program memory having a second memory capacity for storing asecond control program for controlling said four-head playback function;selectively adopting one of a two-head system rotary magnetic head and afour-head system rotary magnetic head in correspondence with selectedone of said first IC and second IC; driving one of said two-head systemrotary magnetic head and said four-head system rotary magnetic head inaccordance with one of said first control program stored in said firstcontrol program memory and said second control program stored in saidsecond control program memory; and selectively inserting one of saidintegrated circuits into said set of IC insertion holes formed on saidprinted circuit board, whereby either one of said first and secondintegrated circuits may be mounted on said printed circuit board and aplurality of video tape players having different functions can bemanufactured in a large scale production method.